Answer :
Answer:
d = 3
Step-by-step explanation:
The common difference d between consecutive terms is
d = - 18 - (- 21) = - 18 + 21 = 3
d = - 15 - (- 18) = - 15 + 18 = 3
d = - 12 - (- 15) = - 12 + 15 = 3
Answer:
d = 3
Step-by-step explanation:
The common difference d between consecutive terms is
d = - 18 - (- 21) = - 18 + 21 = 3
d = - 15 - (- 18) = - 15 + 18 = 3
d = - 12 - (- 15) = - 12 + 15 = 3